Severe Hypertriglyceridemia in a Patient Treated With Sirolimus for Graft-vs-Host Disease Prophylaxis.

Hypertriglyceridemia is an important and well documented adverse effect caused by the immunosuppressive agent sirolimus. Patients treated with sirolimus require frequent monitoring of blood lipid panels and prompt treatment with appropriate triglyceride-lowering therapies. We report the case of an asymptomatic 65-year-old female stem cell transplant recipient who developed extreme hypertriglyceridemia with levels > 19,000 mg/dL (214 mmol/L) (reference range, < 150 mg/dL [< 1.

Selective Downregulation of JAK2 and JAK3 by an ATP-Competitive pan-JAK Inhibitor.

PF-956980 has been used previously as a JAK3-selective chemical probe in numerous cell-based experiments. Here, we report that not only is PF-956980 a pan-JAK ATP-competitive inhibitor but it also causes selective reduction of endogenous JAK2 and JAK3 protein levels in human primary immune cells (in a time-dependent manner), leaving the other JAK family members (JAK1 and TYK2) unchanged. We found that PF-956980 selectively downregulated JAK2 and JAK3 mRNA, corresponding to changes observed at the protein level.